Near-inertial waves and microstructure mixing observations in the Beaufort Sea

Elizabeth Fine, Woods Hole Oceanographic Institution, Woods Hole, MA, United States, Matthew H Alford, Univ Washington, Seattle, WA, United States, Jennifer A MacKinnon, Scripps Institution of Oceanography, La Jolla, CA, United States and John Buchanan Mickett, Applied Physics Laboratory University of Washington, Seattle, WA, United States
Abstract:
In the Beaufort Sea in September of 2015, near-inertial internal waves (NIWs) generated by wind forcing events were observed by a mooring located at 72 35.646' N, 145 1.002' W. Microstructure measurements found moderately elevated (factor of 2-3 compared with background) turbulent dissipation rate () from 20-150 m, reaching a maximum of W kg at 30 m depth. However, in spite of NIW velocity signals penetrating down to the Atlantic Water at 300 m, there was no evidence of elevated associated with NIWs at these depths, and upwards heat flux out of the Atlantic Water was not enhanced in the presence of NIWs. Upper bounds on determined by the decay of HKE with time were consistent with microstructure observations. A finescale parameterization based on both shear and strain measurements was applied. Above the Atlantic halocline at 200 m, agreement between the finescale parameterization and \textit{in situ} measurements of was good; however, within and beneath the Atlantic halocline the finescale parameterization estimates were an order of magnitude lower than observations.